Streak eliminator for offset duplicating machines



1956 H. JACOBS ET AL 2,77 ,840

STREAK ELIMINATOR FOR OFFSET DUPLICATING MACHINES Filed Feb. 16, 1955 2 Sheets-Sheet l HERBERT JAcoBs JOSEPH RICCO BYPAUL GUGLIELMO Nov. 27, 1956 H. JACOBS ET AL STREAK ELIMINATOR FOR OFFSET DUPLICATING MACHINES 2 Sheets-Sheet 2 Filed Feb. 16

HERBERT JACOBS Rrcco GUGLIBL MO JOSEPH PAUL United States Patent STREAK ELIMINATOR FOR OFFSET DUPLICAT- ING MAC -l. S

Herbert Jacobs, Brooklyn, Joseph Ricco, Elmhurst, and Paul Guglielmo, Brooklyn, N. Y.

3 Claims.

This invention relates to a device for eliminating streaks which tend to be printed on paper stock, during passage of the stock through the ejector mechanism of a Mutilith or offset duplicating machine.

It has been found, in use of a machine of the type stated, that when a heavy, solidly printed portion or bleed is printed upon the left and right edge of a sheet of paper stock, the ejection wheels of the ejector and receiving shelf tend to pick up ink and streak the printed sheet.

The main object of the present invention, accordingly, is to provide a device which can be slipped over the wheels'specified, in such a way as to prevent them from picking up any ink from a printed sheet, thus preventing any streaks that would otherwise tend to occur were the device constituting the present invention not used. Ordinarily, paper stock is cut approximately one-fourth of an inch wider than necessary, in order to prevent streaking under the circumstances referred to. With the use of the device, paper of the exact desired size can be run, thus saving money that would otherwise be expended for oversize stock. Further, by use of the invention, it is not necessary to leave the printed material on a table or other support for a time necessary to permit it to dry, before it is cut to exact size for shipping.

Among important objects of the invention are the provision of a device of the type stated which can be applied to conventional machines without requiring modification or redesign of said machines.

Another object of importance is to provide a device as described which will be inexpensive to manufacture, eificient in use, and applicable to or removable from the machine in a minimum amount of time.

Still another object is to provide a device as stated which can be used as a cleaning means for the wheels.

A further object of importance is to provide a wheel cleaning device as stated which will be so designed as to not deviate from its proper position upon the wheels under circumstances which would tend to cause the device to drop into the machine while the machine is in operation.

Still another object is to form the device so as to permit the wheel cleaning pads to be interchanged whenever desired.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure:

Fig. 1 is a fragmentary perspective view of a portion of the ejector and receiving mechanism of the machine, a wheel cleaning device formed in accordance with the present invention being illustrated in dotted outline.

Fig. 2 is a sectional view on line 2-2 of Fig. 1 in which the device is shown in full lines.

Fig. 3 is a transverse sectional view on line 3--3 of Fig. 1, on an enlarged scale, the device again being shown in full lines.

Fig. 4 is an inverted perspective view of the wheel cleaning device per se.

Fig. 5 is a view similar to Fig. 4, a portion being broken away, showing a modified form. I

The reference numeral 10 hasbeen applied to an ejector streak eliminating device formed in accordance with the present invention. The reference numeral 12 has been applied to the ejector and receiving shelf or mechanism of a Multilith or offset duplicating machine. Such a machine includes an upper ejection wheel 14 mounted upon an upper ejection wheel shaft16, a lower ejection wheel 18 in peripheral engagement with a lower ejection roller 20, a pair of slide arms 22 extending between the Wheels in parallel relation, a spacing collar 24 that maintains the properly spaced relation of the slide arms, the spacing collar being mounted upon a bolt 26 extending through the slide arms, and a bolt 28 extending between the lower ends of the slide arms, to mount the lower ejection wheel 18 rotatably thereupon. The upper ends of the slide arms are apertured for extension of the shaft 16 therethrough.

Ordinarily, a pair of upper and lower ejection wheels, connected by slide arms as shown in Fig. 1, is provided at each side of the ejector mechanism, and it will be understood that the Wheel cleaning device 10' would be mounted upon each of the two pairs of wheels.

The device constituting the present invention includes (see Fig. 4) a single piece of metal materialhaving. an elongated intermediate portion 30 integrally formed at opposite sides thereof with parallel ears 32 each of which is provided with transversely spaced outwardly strucklugs 34. At its opposite ends, the'portion 30 is integral with flat, widened heads 36, and each head 36 is formed at opposite sides thereof with inwardly turned flanges 38, engaging between them a rectangular wheel cleaning pad 40.

The device is mounted upon the wheels in the manner shown in Figs; 1-3, overlying the wheels with the pads 40 in contact therewith. Before the device is applied to the wheels, a solution is applied to the pads so that the wheels Will run over the printed copy without causing a streak. Thus, both wheels of a single pair are kept clean at the same time, by the one device. It will be noted, in this connection, that the cars 32 extend into the space between the slide arms (see Fig. 3) with the lugs 34 resting upon the top edges of the slide arms. Due to this arrangement, the pads are maintained in proper relation relative to the wheel peripheries, lightly contacting the wheel peripheries so as not to interfere with proper operation of the machine, though at the same time insuring that the wheels will be kept clean. Further, the ears 32, extending in contact with the inner surfaces of the slide arms, hold the device against lateral deviation, so that the streak eliminator will not fall into the machine while the machine is in operation.

In Fig. 5 there is shown a modified form 10*- which can be molded of plastic material. in this form of the invention, the intermediate portion 39*- has ears 32* formed integrally therewith, and lugs 34 are molded upon the outer surfaces of the ears, rather than being struck out of the material thereof as will be the case when sheet metal is used. At the opposite ends of the portion 30* there are provided flat heads 3e integrally molded at their opposite sides with confronting, undercut flanges 38 The undercut flanges define a dovetail groove on the underside of each head 36, and the pads 4% are formed, at one face thereof, with a dovetail formation complementing the grooves, thus to permit the pads to he slid into the grooves into proper position. The pads 40*, and the pads 40, can, of course, be readily removed by being shifted lengthwise of the heads in a direction away from the midlength part of the device, thus to permit the pads to be readily interchanged whenever desired. I

It will be seen that the device can be applied to any conventional machine of the character referred to, and when so applied, will maintain the ejector wheels in a clean condition, while not interfering in any way with proper operation of the machine.

While we have illustrated and described the preferred embodiments of our invention, it is to be understood that we do not limit ourselves to the precise constructions herein disclosed and that various changes and modifications may be made within the scope of the invention as defined in the appended claims.

Having thus described our invention, what we claim as new, and desire to secure by United States Letters Patent 1. An ejector streak eliminator for an offset duplicating machine of the type including at least one pair of spaced ejection wheels connected by parallel slide arms, comprising a pad support including an intermediate portion, padengaging means at opposite ends of said portion, means on said portion for engaging the respective slide arms, and cleaning pads engaged by said pad-engaging means, said cleaning pads being adapted to contact said Wheels, said pad-engaging means comprising flat heads integrally formed upon opposite ends of the intermediate portion, the pads being removably engaged by the heads, said heads including parallel side flanges adapted to engage opposite sides of the pads, the slide-arm-engaging means comprising a pair of parallel ears integrally formed upon opposite sides of the intermediate portion.

2. An ejector streak eliminator for an ofiset duplicating machine of the type including at least one pair of spaced ejection wheels connected by parallel slide arms, comprising a pad support including an intermediate portion, pad-engaging means at opposite ends of said portion, means on said portion for engaging the respective slide arms, and cleaning pads engaged by said pad-engaging means, said cleaning pads being adapted to contact said wheels, said pad-engaging means comprising flat heads integrally formed upon opposite ends of the intermediate portion, the pads being removably engaged by the heads, said heads including parallel side flanges adapted to engage opposite sides of the'pads, the slide-arm-engaging means comprising a pair of parallel ears integrally formed upon opposite sides of the intermediate portion, said ears being formed with pairs of integral lugs, each pair being adapted to engage against one edge of the respective slide arms. I

3. An ejector streak eliminator for an offset duplicating machine of the type including at least one pair of spaced ejection wheels connected by parallel slide arms, com prising a pad support including an intermediate portion, pad-engaging means at opposite ends of said portion, means on said portion for engaging the respective slide arms, and cleaning pads engaged by said pad-engaging means, said cleaning pads being adapted to contact said wheels, said pad-engaging means comprising flat heads integrally formed upon opposite ends of the intermediate portion, the pads being removably engaged by the heads, said heads including parallel side flanges adapted to engage opposite sides of the pads, the slide-arm-engaging means comprising a pair of parallel ears integrally formed upon opposite sides of the intermediate portion, said ears each being formed with a pair of lugs adapted to engage against one edge of the respective slide arms, the ears being disposed in parallel planes paralleling the planes of the slide arms, the planes of the ears being normal to the plane of the intermediate portion, the heads being disposed in a plane common to that of the intermediate portion, said heads being of a rectangular formation and being enlarged in width relative to the intermediate portion, the flanges of the heads being undercut to provide dovetail grooves, said pads being of dovetail formation in cross section to complement said grooves. I

References Cited in the file of this patent UNITED STATES PATENTS 1,272,863 Schmidt July 16, 1918 1,742,070 Groves Dec. 31, 1929 FOREIGN PATENTS 160,426 Switzerland May 16, 1933 

